To fill the roster spots vacated by Hayward and Nixon, the Packers activated defensive end Jerel Worthy and safety Sean Richardson from the physically unable to perform list.

Worthy, 23, had suffered an ACL tear at the end of the 2012 regular season. He appeared in 14 games for the Packers as a rookie last season, notching 14 tackles and 2.5 sacks. A Michigan State product, Worthy was the other of the Packers’ second-round selections in 2012.

Richardson played five games for Green Bay in 2012 before suffering a season-ending neck injury. He is a second-year pro from Vanderbilt.

Yes, the Packers have suffered their share of hamstring injuries this season. But it’s worth noting that Hayward damaged his while working out on his own, away from the team, during the offseason. Can’t blame the trainer for that one.